Step 1: Background.
India’s cotton textile industry is concentrated in Maharashtra and Gujarat. Mumbai has historically been called the “Manchester of India” due to its dominance in cotton textile production.
Step 2: Analyzing the options.
(A) Kolkata: Known more for jute, not cotton.
(B) Nagpur: Important city, but not the leader in cotton textiles.
(C) Mumbai: Correct — it has been the leading center of cotton textile production in India.
(D) Surat: Known more for synthetic textiles.
Step 3: Conclusion.
Therefore, the leading producer of cotton textiles is Mumbai.